Getting a new Ration Card in Chennai

Hi,

We have come to Chennai two years back and still do not possess a ration card here. All our names (myself, my husband and our 3 and a half year old daughter) are there in our Kerala ration card in my FIL name. Now if we want to get a new ration card in Chennai in my husband's name, what is the procedure? We are at Mogappair (Anna Nagar West) in Chennai... Can we apply for the ration card at all times? or is there any specific time for applying?